A relaxed looking Kourtney balanced her cell phone under her chin while running errands in Los Angeles, California.
Revelation: Kourtney Kardashian was pictured in Los Angeles today after revealing she is pregnant with her second child
And seeing as she is just nine weeks pregnant, there was little sign of a baby bump under her outfit.
The star sported an electric blue blazer, white T-shirt and slim fitting black jeans teamed with knee-length black boots.
Kourtney and partner Scott Disick, 28, already have a son Mason, who turns two on December 14.
No show: At just nine weeks pregnant, there was little sign of a baby bump under the reality star's white T-shirt
The reality show star first revealed the news to this week's issue of Us Weekly.
The older sibling of Kim and Khloé told how she woke partner Scott up at seven o'clock after taking a positive pregnancy test to share the news.
So not blue: The eldest Kardashian sister is beyond happy that she's going to have her second child
These boots are made for walking: The reality star struts confidently through the town of Sherman Oaks
'Now I'm nine weeks along,' Kardashian tells the magazine. 'You're supposed to wait 12 weeks to tell people, but I feel confident.'
In an episode of Keeping Up With the Kardashians in July, Kourtney was seen clashing with mother Kris Jenner after she mentioned that she and Scott were considering trying for another baby.
Announcement: The reality star broke the news on the cover of Us Weekly today
In the episode, Kourtney is insistent that she will marry if and when she chooses, and admits the reason she is hesitant to walk down the aisle is because she doesn't want her children to go through a parents' divorce they way she did as a child.
Kourtney and Scott have broken up a number of times over Kourtney's disapproval of her partner's hard partying and anger issues.
Surprise! Kourtney Kardashian has revealed she is pregnant with her second child
Little bump ahead: Kourtney covered up her form with a billowing dress on a date with boyfriend Scott Disick earlier this weekDuring their stint in Miami last year, Kourtney ordered Disick to leave her and their son alone after he turned violent and smashed a mirror, telling him 'I love Mason more than I love you.'
Scott has since worked out his issues and has said he has no problem marrying his long-time love.
He even proposed to an unimpressed Kourtney in the final episode of last season's Kourtney and Kim Take New York.
New sibling: The couple are already parents to adorable Mason, who turns two next month
Barbara Walters finds the Kardashians fascinating
Legendary journalist Barbara Walters announced her 19th annual 10 Most Fascinating People list today, and the Kardashian sisters are at the top of her list. Other celebrities who made the cut include: Simon Cowell, Katy Perry, Pippa Middleton, Modern Family stars Eric Stonestreet and Jesse Tyler Ferguson, Donald Trump and New York Yankees captain Derek Jeter.
'It wasn't like we weren't trying,' Disick says. 'We kind of just said, "If it's meant to be, it'll be.'"
However, Entertainment Tonight today reported that there may well be a wedding in the works for the oldest Kardashian daughter.
Sources told the website and news show that the wedding will be the 'complete antithesis of sister Kim's lavish affair and that it will be low key, just family,' with 'whispers that it will take place at the Kardashian family home.'
The news comes following an interview with Kourtney's younger sister Kim who recently separated from husband Kris Humphries after just 72 days.
Feeling good: Kourtney, who is just nine weeks along, was in high spirits yesterday as she shopped in LA
Growing brood: Mason's arrival in 2009 was a happy surprise for the couple, who have been together on and off for almost five years
‘At first I was like, I want six kids. Then I went down to four, then I was down to three, and now I'm like, maybe I won't have any.
‘Maybe my fairy tale has a different ending than I dreamed it would.’
However, Kim today tweeted her excitement at the happy news.
Defiant: Kourtney clashed with mother Kris Jenner earlier this year over not wanting to get married before having another baby
No wedding bells: Kourtney has said she has no plans to marry until she's sure her children won't have to go through a divorce the way she did
'This is such a blessing and the whole family is beyond thrilled!' she wrote. 'I just know Mason will make the best big brother and I can’t wait to meet my new little niece or nephew!
'Congratulations Kourtney and Scott. Xo'
And her sister Kendall Jenner also tweeted her excitement about the news.
'My sister's [pregnant again!!!!' she wrote. 'Congratulations @KourtneyKardash and @ScottDisick!!!! You guys will make great parents...AGAIN! :)'
Excited: Kim Kardashian tweeted her congratulations to her older sister today
Family fun: Kendall Jenner today tweeted her excitement to Kourtney and Scott via her Twitter account
Speaking on The Today Show last month, the 27-year-old admitted: 'It's so hard. I never knew about ovulation and the limited amount of time that you have to get pregnant.
'I never knew about that. No-one ever taught me that.'
For the full interview, buy Us Weekly, on US newsstands today or visit UsWeekly.com
Baby race: Both of Kourtney's sisters Kim and Khloé have spoken publicly in recent weeks about their dreams of having children and fears it may not happen